| grenadier | 1. Originaly, a soldier who carried and threw grenades; afterward, one of a company attached to each regiment or battalion, taking post on the right of the line, and wearing a peculiar uniform. In modern times, a member of a special regiment or corps; as, a grenadier of the guard of Napoleon I. One of the regiment of Grenadier Guards of the British army, etc. 2. <zoology> Any marine fish of the genus Macrurus, in which the body and tail taper to a point; they mostly inhabit the deep sea; called also onion fish, and rat-tail fish. 3. <zoology> A bright-coloured South African grosbeak (Pyromelana orix), having the back red and the lower parts black. Origin: F. Grenadier. See Grenade. Source: Websters Dictionary (01 Mar 1998) |
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| grenadillo | A handsome tropical American wood, much used for making flutes and other wind instruments. Synonym: Grenada cocos, or cocus, and red ebony. Origin: Sp. Granadillo. Source: Websters Dictionary (01 Mar 1998) |
| grenz ray | Very soft X-ray's, closely allied to the ultraviolet ray's in their wavelength (i.e., long) and in their biologic action upon tissues; they are produced by a specially built vacuum tube with a hot cathode operating from a transformer delivering not more than 8 kw. Origin: Ger. Grenze, borderline, boundary (05 Mar 2000) |
| grenz zone | In histopathology, a narrow layer beneath the epidermis that is not infiltrated or involved in the same way as are the lower layers of the dermis. Origin: Ger. Grenze, borderline, boundary (05 Mar 2000) |
| gression | Displacement of a tooth backward. Origin: L. Grador, pp. Gressus, to walk, fr. Gradus, a step (05 Mar 2000) |
| gressorious | <ornithology, zoology> Adapted for walking; anisodactylous; as the feet of certain birds and insects. Origin: L. Gressus, p. P. Of gradi to step, go. Source: Websters Dictionary (01 Mar 1998) |
| Greville bath | An obsolete treatment with nonluminous electric hot air given at a very high temperature. (05 Mar 2000) |
| grex | <biology> The multicellular aggregate formed by cellular slime moulds (Acrasidae): the slug like grex migrates, showing positive phototaxis and negative gravitaxis, until culmination (the formation of a fruiting body) takes place. Coordination of the activities of the hundreds of thousands of individual amoebae that compose the grex may involve pulses of cyclic AMP in Dictyostelium discoideum, a species in which cAMP is the chemotactic factor for aggregation. (18 Nov 1997) |
| grey | See Gray (the correct orthography). Source: Websters Dictionary (01 Mar 1998) |
| grey crescent | <biology> A region near the equator of the surface in the fertilized egg of various amphibia, often of greyish colour, that appears to contain special morphogenetic properties. (18 Nov 1997) |
| grey matter | <anatomy> Gray matter, the thinking brain, appears gray because it is composed of numerous nerve cells and blood vessels. The outer layer of the cerebrum - the cerebral cortex and areas deep within the brain - the basal ganglia, are made up of grey matter. See: white matter. (16 Dec 1997) |
| Grey Turner's sign | <clinical sign> Local areas of discoloration about the umbilicus and in the region of the loins, in acute haemorrhagic pancreatitis and other causes of retroperitoneal haemorrhage. (05 Mar 2000) |
| greylag | <zoology> See Graylag. Source: Websters Dictionary (01 Mar 1998) |